quarkus-resteasy-jsonb Marshaling Generic Type results in WARNINGS on each request

[avboy72]

Using quarkus-resteasy-jsonb for my RESTful service

and with this class

public class MyEnvelopeClass<T> {
    private T content;

    public MyEnvelopeClass(T content) {
        this.content = content;
    }

    public T getContent() {
        return content;
    }
}

Returned from this resource method:

    @GET
    @Path("/{id}")
    public MyEnvelopeClass<MyPayloadClass> getById(@PathParam("id") String id){
        return new MyEnvelopeClass<MyPayloadClass>(new MyPayloadClass());
    }

The result from my GET request returns the correct payload, however, I get this warning in the log each time the request is made.

2019-08-15 12:25:36,477 WARNING [org.ecl.yas.int.ReflectionUtils] (executor-thread-1) Generic bound not found for type T declared in class MyEnvelopeClass.

If I switch to quarkus-resteasy-jackson, the warning is not logged. ( however I have to include other dependencies to get "Instant" to serialize properly, and configure the ObjectMapper to use it... Then I end up with Maven warnings too... so I would prefer to stick with the jsonb dependency )

If I change my code to use an anonymous inner class, extending MyEnvelopeClass with the Generic type... the warning is not logged:

    @GET
    @Path("/{id}")
    public MyEnvelopeClass<MyPayloadClass> getById(@PathParam("id") String id){
        return new MyEnvelopeClass<MyPayloadClass>(new MyPayloadClass()){};
    }

I can use this as a workaround, but I would rather fix the issue holistically rather than within every single Resource method we write.

Thanks!

-sean

Environment (please complete the following information):

• Output of uname -a or ver:
  Darwin USMACEA013SSCOT 18.7.0 Darwin Kernel Version 18.7.0: Thu Jun 20 18:42:21 PDT 2019; root:xnu-4903.270.47~4/RELEASE_X86_64 x86_64

• Output of java -version:
  openjdk version "11.0.3" 2019-04-16
  OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.3+7)
  OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.3+7, mixed mode)

• GraalVM version (if different from Java):
  openjdk version "1.8.0_222"
  OpenJDK Runtime Environment (build 1.8.0_222-20190711112007.graal.jdk8u-src-tar-gz-b08)
  OpenJDK 64-Bit GraalVM CE 19.1.1 (build 25.222-b08-jvmci-19.1-b01, mixed mode)

• Quarkus version or git rev:
  0.20.0

[sean-scott-lr]

Also, I just tried to run in Native mode. And neither option above produces output from my endpoint. just '''{}''' is returned

[sean-scott-lr]

More Information. Turns out the anonymous class is merely changing the behavior of what is being logged for the very first request after a hot-redeploy. ( Adding the {} makes the first request not get logged with a warning, but subsequent ones do )

So the anonymous class was just a red herring. I always get the warning.

[sean-scott-lr]

Adding @RegisterForReflection Fixed the issue with Native mode. Generics must not be supported in the Quarkus auto-registration?

So the only issue seems to be the noisy warning message

[geoand]

I opened #3557 to handle the case you mentioned about needing @RegisterForReflection - that should not be necessary.

As for the log message, it is coming from Yasson, not sure what we could do about it.

[gsmet]

@geoand well, it could be a Yasson issue or a RESTEasy issue (with RESTEasy not providing the correct information to Yasson).

@sean-scott-lr could you try to reproduce the issue with simple Yasson code. If you can reproduce it then it's likely a Yasson issue and it should be reported here: https://github.com/eclipse-ee4j/yasson/issues

[sean-scott-lr]

@gsmet I will give it a shot, but this week will be tough because my schedule is packed.
...edit
Googled how to use the Yasson API, and it looked easy... so I went ahead and just added this to an endpoint that wasn't generating a warning.

            JsonbConfig config = new JsonbConfig() .withNullValues(false);
            Jsonb jsonb = JsonbBuilder.create(config);
            String result = jsonb.toJson(new MyEnvelopeClass<MyPayloadClass>(new MyPayloadClass()));
            System.out.println( result );

Yep, this bit of code generates the warning. I will open an issue on Yasson.

[aguibert]

FYI I've delivered the fix for this issue in Yasson which will be included in the next release (1.0.6)

[aguibert]

@gsmet go ahead and assign this issue to me please. I can use it as a ticket to upgrade Quarkus to Yasson 1.0.6 when it gets released

[rsvoboda]

@aguibert any idea when 1.0.6 will be released ?

[aguibert]

@rsvoboda it's been a while since we released Yasson 1.0.5 so I suppose we're about due for a new release. I'll work on cutting a new Yasson release this week and getting Quarkus updated